Engelm. March 27, 2004, Zion National Park, Wash. Co., Utah Greatly misunderstood species, only known from Utah in Washington Co. Stems few to many forming clumps; flowers often dioecious; flowers have a constricted “waist”; smooth spines; heads taller, flowers smaller, narrower, areoles closer together than E. mojavensis
. Visited by bees more than hummingbirds. Blooms earlier than E. mojavensis
. Often referred to as E. triglochidiatus
which as now understood does not occur in Utah (or if it does, only in far southeastern corner of the state).